(C++) Class method, like a callback function. How to best implement?

Question

C++ / C#

Class method like callback. How to implement in the most optimal way?
I’m asking about the optimal one, because I’ve already read a lot about this, but I still don’t understand what is better to use ...
Whoever dug into this in practice, give advice, please.

Answer 1

If the callback is for the system (for example, a handler for something called from the OS), then only as a static method with the necessary specifiers.
If for convenient use inside your code, then you can use a ready-made solution (FastDelegate, for example, is described: here ).
PS Yes, I completely forgot that the fresh C ++ standard now has std:: function.